Lathe



June 10,1924. 1,497,487

L. A. CARTER LATHE Filed April 20 1923 r Patented June 10, 192.4

UNITED STATES LIONEL A. CARTER, 01* ST. LOUIS, MISSOURI.

LATHE.

Application filed. April 20, 1923. Serial No. 633,550.

T 0 all whom it may concern:

Be it known that I, LioNnn A. CARTER, a subject of Great Britain, and a resident of th city of St. Louis and State of Missouri, have invented a new and useful improvement in Lathes, of which the following is a specification.

This invention relates to lathes and par ticularly to the manner of securing the face or chuck plate to the head-stock spindle.

The principal objects of the present invention are to provide for readily attaching and detaching the face plate, to avoid cocking of the threads, to prevent wabbling of the face plate on the spindle, and to obtain other advantages hereinafter appearing. The invention consists in the construction and combinations of parts hereinafter described and claimed.

The accompanying drawing which forms part of this specification, is a longitudinal sectional view of a portion of a lathe headstock provided with a spindle and face plate construction embodying my invention.

The accompanying drawing shows only the forward end portion of the head-stock 1 and spindle 2 of a lathe. This construction of head-stock is well-known and it isconsidered unnecessary to illustrate it in detail. The forward end of the spindle 2 is journaled in a suitable bearing 3 provided therefor in the head-stock l and has a hard ened forward end or nose portion that or tends beyond the forward end of the headstock and forms a support or bearing for a face or chuck plate 4 which is secured thereon. As shown in the drawing, the nose or forward end portion of the spindle 2 is of reduced diameter and is threaded externally, as at 5, for cooperation with a threaded portion of the central cylindrical bore in the face or chuck plate 4:.

The cooperating threads on the spindle and face plate terminate short of the forward ends of these members; and the portions of the spindle and bore that are located between their threaded portions and their forward ends are of substantially the same diameter, whereby the forward end portion of the spindle cooperates with the forward end portion of the bore in the face plate and forms a bearing surface for the forward end portion of the face plate. The rear end portion of the bore in the face plate is of a diameter corresponding to the diametor of the body portion of the spindle which cooperates therewith and thus forms a bearing surface for the rear end portion of the face plate; and the annular shoulder 6 formed by th said enlarged rear end portion of said face plate abuts against the shoulder formed by the reduced nose portion of the spindle and thus takes the end thrust of the face plate.

it is noted as a very important advantage of my invention that the face plate may be very quickly and easily mounted on the spindle; for the reduced nose portion of the spindle facilitates piloting of the face plate on the spindle; and it also relieves the operator of the weight of the face plate when turning the same to catch the thread and thus prevents damage thereto. It is also noted. that the construction provides hardened. and accurately ground bearing surfaces both in front and back of the threads, which surfaces have an accurate fit in the large and small diameters of the bore in the face plate and thus prevent wabbling thereof. It is also noted that this wabbling or vibrating of th face plate from side to side is further prevented by the engagement of the shouldered portion of the bore in the face piate with the thrust shoulder on the spinc c.

It is obvious that changes may be made without departing from my invention and T. do not wish to be limited to the precise construction shown and described.

What I claim is:

1. The combination with a rotary spindle having an end portion of reduced diameter and provided with threads, of a member having a central bore which is threaded for cooperation with the threaded portion of said spindle, the cooperating threaded portions of said spindle and said bore terminating short of said end of said spindle and the corresponding end of said bore, respectively, and the portions of said spindle and said bore located between their threaded portions and said ends thereof being of substantially the same diameter, the opposite end portion of said bore being of a diameter adapted to fit the larger diameter of said spindle.

2. The combination with a rotary spindle having an end portion of reduced diameter and provided with threads, of a member having a central bore which is threaded for cooperation with the threaded portion of said pi dle, the recreating threaded por tions of said spindle and said bore terminating short of said end of said spindle and the corresponding end of said bore, respectively, and the portions of said spindle and said bore located between their threaded portions and said ends thereof being of substantially the same diameter, the opposite end portion of said bore being of a diameter adapted to fit the larger diameter of said spindle, the shoulder formed by the larger diameter of the bore in said member being adapted to abut against the shoulder formed by th reduced end portion of said spindle. 3; The combination with a head-stock of a lathe, of a spindle'journaled in said headstock with it forward end portion extending'beyond the forward end of said headstock, and a face plate adapted to be mounted on the forward end portion of said spindle, the forward end portion of said spindle being of reduced diameter and provided with threads, and said face plate being pro- Vided with a central bore wihch is threaded 1 for cooperation with the threaded portion of said spindle, the cooperating threaded portions'of said spindle and said bore terminating short of their forward ends, and the portions of said spindle and said bore located between their threaded portions and 30 their forward ends being of substantially the same diameter, the rear end portion of said bore being of a diameter adapted to fit the larger diameter of said spindle.

4:. The combination with a head-stock of a lathe, of a spindle journaled in said headstock with its forward end portion extending beyond the forward end of said headstock, and a face plate adapted to he mounted on the forward end portion of said spindle, the forward end portion of said spindle being of reduced diameter and provide-:1 with threads, and said face plate being provided with a central bore which is threaded for cooperation with the threaded portion of said spindle the cooperatin; threaded portions of said spindle and said bore terminating short of their forward ends, and the portions of said spindle and said bore located between their threaded portions and their forward ends being of substantially the same diameter, the rear end portion of said bore being of a diameter adapted to fit the larger diameter of said spindle, the shoulder formed by the larger diameter of the bore in said face plate being adapted to abut against the shoulder formed by the reduced forward end portion in said spindle.

.Signed at St. Louis, Missouri, this 18th day of April, 1923.

LIONEL A. CARTER. 

